parens.c revision 136645
10Sduke/* parens.c -- Implementation of matching parentheses feature. */ 2553Sohair 30Sduke/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. 40Sduke 50Sduke This file is part of the GNU Readline Library, a library for 60Sduke reading lines of text with interactive input and history editing. 70Sduke 80Sduke The GNU Readline Library is free software; you can redistribute it 90Sduke and/or modify it under the terms of the GNU General Public License 100Sduke as published by the Free Software Foundation; either version 2, or 110Sduke (at your option) any later version. 120Sduke 130Sduke The GNU Readline Library is distributed in the hope that it will be 140Sduke useful, but WITHOUT ANY WARRANTY; without even the implied warranty 150Sduke of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 160Sduke GNU General Public License for more details. 170Sduke 180Sduke The GNU General Public License is often shipped with GNU software, and 19553Sohair is generally kept in a file called COPYING or LICENSE. If you do not 20553Sohair have a copy of the license, write to the Free Software Foundation, 21553Sohair 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ 220Sduke#define READLINE_LIBRARY 230Sduke 240Sduke#if defined (__TANDEM) 250Sduke# include <floss.h> 260Sduke#endif 270Sduke 280Sduke#include "rlconf.h" 29 30#if defined (HAVE_CONFIG_H) 31# include <config.h> 32#endif 33 34#include <stdio.h> 35#include <sys/types.h> 36 37#if defined (HAVE_UNISTD_H) 38# include <unistd.h> 39#endif 40 41#if defined (FD_SET) && !defined (HAVE_SELECT) 42# define HAVE_SELECT 43#endif 44 45#if defined (HAVE_SELECT) 46# include <sys/time.h> 47#endif /* HAVE_SELECT */ 48#if defined (HAVE_SYS_SELECT_H) 49# include <sys/select.h> 50#endif 51 52#if defined (HAVE_STRING_H) 53# include <string.h> 54#else /* !HAVE_STRING_H */ 55# include <strings.h> 56#endif /* !HAVE_STRING_H */ 57 58#if !defined (strchr) && !defined (__STDC__) 59extern char *strchr (), *strrchr (); 60#endif /* !strchr && !__STDC__ */ 61 62#include "readline.h" 63#include "rlprivate.h" 64 65static int find_matching_open PARAMS((char *, int, int)); 66 67/* Non-zero means try to blink the matching open parenthesis when the 68 close parenthesis is inserted. */ 69#if defined (HAVE_SELECT) 70int rl_blink_matching_paren = 1; 71#else /* !HAVE_SELECT */ 72int rl_blink_matching_paren = 0; 73#endif /* !HAVE_SELECT */ 74 75static int _paren_blink_usec = 500000; 76 77/* Change emacs_standard_keymap to have bindings for paren matching when 78 ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */ 79void 80_rl_enable_paren_matching (on_or_off) 81 int on_or_off; 82{ 83 if (on_or_off) 84 { /* ([{ */ 85 rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap); 86 rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap); 87 rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap); 88 } 89 else 90 { /* ([{ */ 91 rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap); 92 rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap); 93 rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap); 94 } 95} 96 97int 98rl_set_paren_blink_timeout (u) 99 int u; 100{ 101 int o; 102 103 o = _paren_blink_usec; 104 if (u > 0) 105 _paren_blink_usec = u; 106 return (o); 107} 108 109int 110rl_insert_close (count, invoking_key) 111 int count, invoking_key; 112{ 113 if (rl_explicit_arg || !rl_blink_matching_paren) 114 _rl_insert_char (count, invoking_key); 115 else 116 { 117#if defined (HAVE_SELECT) 118 int orig_point, match_point, ready; 119 struct timeval timer; 120 fd_set readfds; 121 122 _rl_insert_char (1, invoking_key); 123 (*rl_redisplay_function) (); 124 match_point = 125 find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); 126 127 /* Emacs might message or ring the bell here, but I don't. */ 128 if (match_point < 0) 129 return -1; 130 131 FD_ZERO (&readfds); 132 FD_SET (fileno (rl_instream), &readfds); 133 timer.tv_sec = 0; 134 timer.tv_usec = _paren_blink_usec; 135 136 orig_point = rl_point; 137 rl_point = match_point; 138 (*rl_redisplay_function) (); 139 ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); 140 rl_point = orig_point; 141#else /* !HAVE_SELECT */ 142 _rl_insert_char (count, invoking_key); 143#endif /* !HAVE_SELECT */ 144 } 145 return 0; 146} 147 148static int 149find_matching_open (string, from, closer) 150 char *string; 151 int from, closer; 152{ 153 register int i; 154 int opener, level, delimiter; 155 156 switch (closer) 157 { 158 case ']': opener = '['; break; 159 case '}': opener = '{'; break; 160 case ')': opener = '('; break; 161 default: 162 return (-1); 163 } 164 165 level = 1; /* The closer passed in counts as 1. */ 166 delimiter = 0; /* Delimited state unknown. */ 167 168 for (i = from; i > -1; i--) 169 { 170 if (delimiter && (string[i] == delimiter)) 171 delimiter = 0; 172 else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i])) 173 delimiter = string[i]; 174 else if (!delimiter && (string[i] == closer)) 175 level++; 176 else if (!delimiter && (string[i] == opener)) 177 level--; 178 179 if (!level) 180 break; 181 } 182 return (i); 183} 184